package com.atguigu.flink.chapter07.state;

import com.atguigu.flink.bean.WaterSensor;
import com.atguigu.flink.util.AtguiguUtil;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.util.Comparator;
import java.util.List;

public class Flink05_State_keyed_List {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment
                .getExecutionEnvironment()
                .setParallelism(3);
        env
                .socketTextStream("hadoop162",9999)
                .map(value -> {
                    String[] datas = value.split(",");
                    return new WaterSensor(datas[0], Long.valueOf(datas[1]), Integer.valueOf(datas[2]));

                })
                .keyBy(WaterSensor::getId)
                .process(new KeyedProcessFunction<String, WaterSensor, String>() {

                    private ListState<Integer> max3VcState;

                    @Override
                    public void open(Configuration parameters) throws Exception {
                        max3VcState = getRuntimeContext()
                                .getListState(new ListStateDescriptor<Integer>("max3VcState", Integer.class));
                    }

                    @Override
                    public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {
                        max3VcState.add(value.getVc());

                        List<Integer> list = AtguiguUtil.toList(max3VcState.get());

//                        list.sort((o1, o2) -> o2.compareTo(o1));
                          list.sort(Comparator.reverseOrder());
                        if (list.size() > 3) {
                            list.remove(list.size() - 1);
                        }

                        max3VcState.update(list);

                        out.collect(ctx.getCurrentKey() + " " + list.toString());

                    }

                })
                .print();

        env.execute();
    }
}
